Sawdust furnace grate



Nov. 10, 1931. w R. THOMAS 1,

SAWDUST FURNACE GRATE Filed Nov. 4, 1929 7 U 7 I INVENTOR. 7 Mlle/90v K. THOMAS,

A TTORNEYJ 5 provide ae oree-flrai t f r n i'enah r te;- r

15;" s "gene ed m this-arr ngeme I Et mes from. th ee o:

ho es, t ro gh he bar andsaround m ed;- by using xfire-br 15 m. o wth furnac afiQ redu esfih O tm'Qi i iQiIltQIIflllCQ lhlloin ic y be ause-ther je l g 1 u lln-ia di io n use, V, itu therir d esat e reel 1, a f to: b rn: out-as} quickly.

anthem s ok :heetb in'g c int the peem 'a no" 1111061 4 1929; :Serial"No.*"404,655;1

e 5 a d 5' re e mode ws. qt ve yii jia e o the grate -.L. k n mera s deslgn te icorre speedin parts in all'of the figures of the. drawings. Z; -Ia e r es 0 1M1 in n embui d nwise e tlnelim- :ph y. tw l t minen.red rick; -f subs antia the rit h e Wa lyine in b tantia T are? iSi'n .with each Qth61.,..tlld in, sp.aoed ce b- 1 mm koee s h wn-s l-Mpsth Wa W th 0 firei i k l. fiew hainzateo 0on1 notion with theQgrates; hereinafter detutethe v floorfl-soif the furnace, s Qi-thesrate y sflufi faces of the -fir1e bricknels rf etfip h" t s'w'f d-arThe tesae'he ,elree l JSJ QLK Bda aei di etedfi i, en he dv tie e t 1 111 1 the ei' resse tr n z embe 7 0 rec e guar g a e mm em'be "s- 9-Th g te-fr me mberse eaw r vi dl withlat-e fel y ext nding; flang s 51, 1 h a eemb ded; inthezwallsa tw fine. brick a d;$1 6.:oolnnionbrid i .willh rateiram 's als compriseownward ymr uralfo t ck draf ie db of, stion' hamh. b thesta k istue t rou h Qun .dir tlynnd letilre, and rendering. the whole-e rin. no; p t n efethe-gm iframeavr ich r ex-' tends-,upwardly heyonclthe-flanges. :aidsfl .in "preventing the fire, brick, ;:fro 1 n prumblirig.

pates tween the several walls constiet. ai du ts a th se-several ngitud1 lye endinsrid cts o rnmuni w h a O 611 cross..dl et.l3,..t iwliichy P16 third. ,7

h tjfuelz as sup center of the furnace. The result is that these grates become sohot, because of the lack of draft through them, that they be- 1 come warped and sag down until they are useless, and have to be changed very frequently. The device of the present invention is intended to obviate the foregoing difliculties.

In the accompanying drawings,

Fig. l is a horizontal sectional View of a portion of a furnace constructed in accord. ance with the invention,

Fig. 2 is a plan View of one frames,

Fig. 8 is a transverse sectional view through one of the grate frames and grates; and the associated walls, and

of the grate sti g per ions ll wh c a d-in brac g-th fi Value from the fuel. It is iust as necessary 40 the forced draft between the walls 6, aids in cooling these walls, and consequently, aids amount of fuel and air, while if-I wish todecrease the heat of the furnace, thisis easily accomplished by merely reducing the amount of air supplied to the furnace.

.The device of the present invention uses only about one-third the amount of grates that the conventional naturalidraft furnaces use. and it gives a solid floor between the grates to receive the weight of the fuel. It is verv much easier to keep clean than any other device of this nature with which I am familiar. It has the advantage over known furnaces that because the air is forced throu h the grates. the rates are kept cooler and clinkers are prevented from forming on the grates. It also has an advantage over devices of this nature em loying upstanding n zzles. because in the present construction,

the crates and t e fire br ck are' on the same level. a d the floor of the furnace can-be Cle ned hv shoving a slice bar over the floor." With the right mixt re of air. we'are ab-" SolutelV sure of securing a maximum heat to have the right volume of air to a fuel bed o sawdust under the varving moisture conditions existing in the sawdust. as it is with asoline or any other hi 'h-grade fuel. This furnace is admirahlv adapted to handle fuel con aining a very h h mo sture content.

' With it we can burn kiln dried shavings and sa dust from the log. which run from to' 7 5% moisture. The lar egrate area provides a la ge volume draft. at low pressure. Where hi h pressu e draft is util zed. the lightest and be t fuel is carried off th ough the smokewith their upper faces substantially fiush= Having described my invention, what I claim is:

1. A furnace of the character described,

comprising a plurality of substantially parallel spaced walls forming ducts between them,'the upper faces of which are composed of'fire brick, rectangular grate frames having laterally extending flanges embedded in opposed walls, saidgrate fraines comprising transversely; extending rests at their opposite ends, and grates supported upon said rests with their upper faces substantially flush with the upper faces of the fire brick, said grates being sufiicientin number to substantially close the tops'of the ducts.

2. A furnace of the character described,

comprising aplurality ofsubstantially parallel spaced walls forming ducts-between them the upper face s of which are composed a of fire brick, rectangular grate frames -ha,V. ing laterally extending flanges embedded in opposed walls, said grate frames comprising transversely extending rests at their opposite ends, and grates supported upon said rests with the upper faces of the fire brick, said grates being sufficient in number to substantially close the tops of the ducts, and means for supplying forced draft to said ducts.

A furnace of the character described;- comprising a plurality of substantially par allel spaced walls forming ducts between them,the upper faces of which are composed of tire brick, rectangular grate frames having laterally extending flanges embedded in op posed walls, said grate frames comprising transversely extending rests at their opposite ends, and grates supported upon said rests with their upper faces subtantially flush with the upper faces of the fire bricl -said grates being sufficient'in number to'substantially close the tops of the ducts, a transversely extending duct; common to all of the first named ducts, and'means for supplying forced draft air to said transversely extending duct In testimony whereof I'aflix my signature.

' WARRENR. THOMAS.-

stack. onlv partly burned. J The onlv remedy for this is to deliver the air directlv to the bottom of the .fuel bed, andto have it under such controlthat it can be regulated in accordance with the moisture content of the fuel. With natural or stack draft it is nearly impossible to do this. especially with fuel that runs over 35 or 40%,moisture.

It is tobe understood thatthe invention is ..not limited to the precise construction set forth, but that it includes within its purview' whatever changes fairly come within either theter'rns or the spirit ofthe appendedclaims. 

